Indexing mechanism



Feb. 6, 1940. L. CARLSEN 96 INDEXING MECHANISM FiledAug. 23, 1938 7Sheets-Sheet 1 ATTORNEY Feb. 6, 1940. CARLSEN 2,188,996

INDEXING MECHANISM Filed Aug. 23, 1958 7 Sheets-Sheet 4 III lNV ENTORATTORNEY/0' 9 L. o. CARLSEN INDEXING MECHANISM Filed Aug. 23, 1938 '7Sheets-Sheet 5 INVENTOR OKs 0 a ATTORNE Feb. 6, 1940. Q, CARLSEN2,188,996

INDEXING MECHANISM Filed Aug. 23, 1958 '7 Sheets-Sheet 7 .54 1&1 152 1&01(50 126;

INVENgR ocwa g' 6Q arZserz ATTORN Patented Feb. 6, 1940 PATENT orrlcr:

INDEXING MECHANISM Leonard C'arlsen, Rochester, N. Y., assignor toGleason Works, Rochester, N; Y., a corporation of New York v ApplicationAugust 23,

12 Claims The present invention relates to indexing mech hereinafterfrom the specification and from the recital .of the appended claims.

Two'ldifferent embodiments of the invention are illustrated in theaccompanying drawings, in which: 1

Fig. '1' is a fragmentary end elevation of an v indexing mechanism builtaccording to one embodiment'of the invention;

v Fig. 2-is a fragmentary sectional view showing details of thismechanism and particularly the means for rotating the work spindle,after it has been unlocked, to effect indexing; j

*Fig. 3 is a fragmentary sectional view showing vthe sameand cooperatingparts for shifting the work spindle rotating mechanism into and out ofoperative position;

Fig. 4 is afragmentary side elevation, looking at the indexing mechanismfrom a position about 90 from that shown in Fig. 2;

Fig. dis a fragmentary end elevation of an indexing mechanism madeaccording to a further embodiment of the invention and particularlyadapted for use on machines that operate according to the generatingprinciple;

Fig. 6 is a sectional view through the work spindle and work head ofa'machine equipped with the indexing mechanism shown in Fig. Fig. '7 isa fragmentary side elevation of the indexing mechanism itself, showingthe parts in position for rotating the Work spindle to eifect indexingthereof;

Fig. 8 is a corresponding view, showing the work spindle rotatingmechanism out of operat ing position;

Fig. 9 is a perspective view of the deflector dog that controls theposition of the work spindle rotating mechanism; and

Fig. 10 is a diagrammatic view illustrating the interconnection betweenthe locking means and 1938. Serial No; 226,320, (cl. 90-41) employedeither on a machine in which the cutting, operation is per- :formedwithout a generating roll. and the work spindle. remains stationaryexceptv for the index ing operation. The embodiment'of the-inven- 5 tionillustrated in Figs. 1 to 4 inclusive is for a a generating machine oron machine that operates without generating roll and willfirst bedescribed.

I5 denotes the work spindleof a gear cutting or gear grinding machineupon which the indexing mechanism of this invention. isto be used.

A notched index plate 1.6 and a Geneva wheel I! are-keyed or'otherwisesecured to the work spindle I5. They are held against axial movementrelative tothe work spindle by a lock-nut l8. Both the index plate l6and the Geneva Wheel I! have as many notches as there are tooth spacesin the gear to be produced. The notches in the index plate are denotedat while those in the Geneva wheel are designated at 2|. denotes thelock-lever. This lever is provided with an integral tooth or dog 26thatis adapted to engage in a notch,20 of the index plate iii to lockthe work spindle against rotation during formation of the tooth spacesof the gear which is being cut or ground upon the machine on which theindex mechanism is used;

The lock-lever 25 is pivotally mounted on a pin 21 that is secured inthe work head or support 28 of the machine. I

r The locking dog 26'is continuously urged to ward locking position byaspring-pressed plunger 29. This-plunger 29 is suitably housed inajbosstill-that is formed integral with the'work head or support 281. Theplunger engages a hardened contact-tip 3| that is secured in the tail ofthe lock lever 25.

coil Spring 32; 1. g

' To effect indexing of the work spindle, the locking dog. 26 isdisengaged from the index plate l6 and the work spindle is rotatedthrough the angular'distance between successive notchesof the indexplate It and then the work spindle is relocke'd by reengaging the lockdog with a new notch of the index plate. The means forrotating the workspindle includes a pin 35- and a cam 36.- The'pinisadaptedto'be engagedperiodically-with a notch of the Geneva wheel- IL It is secured to thecam to project beyond the front face'of the cam, "asclearly-shown inFigs. 2 and v4.

There is a block ."itt-secured by screws 39 to one side of the indexlock lever 25. This block is formed witha nose lll. The cam 36 isadapted to be engaged with the nose Also that as the The plunger isactuated by the which is secured in thesupport' 48.1

plate [6.

cam is rotated in engagement with this nose, the locking dog 26 will bedisengaged from the index plate to unlock the work spindle and permit ofthe indexing operation.

The cam is secured by screws 42 and a dowelpin 43 (Fig. 2) to a spurgear 45and to the enlarged head 46 of a shaft 41. The shaft is mountedforaxial reciprocatingmovement in a bracket or support 48 that issecured to or integral with the work head 28.

The reciprocatory movement of the shaft 41 is efiected by rotation of acam 50 (Figs. 1 and 3). There is a yoke member 5| (Figs. 2 and 3)pivotally mounted at its lower end upon a pin.52 Mounted in this yokemember is a stud 54 on which is journaled a tapered roller 55 that isheld on the stud by a washer 56 and screw- 51. The roller-55 engages inthe track way 58 of the cam 50 so that as the cam 50 is rotated, theyoke 'member may be swungabout its.piV0t.52'. v

The yoke member is bifurcated at its upper end and each furcationisnotched to engage a pin 60-. The pins fill. project from opposite sidesof a sleeve 6! that isjournaled by means of a bushing 59: on the shaft4?. The bushing is'heldagainst axial movement relative to the. shaft bythe nut 69 that threads on the shaft. 3, Through rotation ofthecam 50,then, the shaft 4?. is moved to and froto move the pin'35 and cam 36into and out of operative engagement with the Geneva wheel I7 and nose150f lock lever. 25, respectively. The

cam 50 is. driven fromany suitable source of power by means of thewormwheel 62 .which is secured to onev side of the cam by screws 63 and thedowel-pin 64.

The gear 35. meshes with a long-faced pinion 65 whichis keyed orotherwise fastenedto a shaft 66 that is. journaled in the support. 48parallel with the shaft 4]. The, shaft 65, isqdriven from a bevel gearfiflj through a clutchmember 68.

In operation, the bevel gear 67; and shaft Mare preferably'rotatedcontinuously in time with the worm wheel, 62; which rotates the.cam 55?. During formation of the tooth surfaces of the gear on themachine, the index mechanism isv locked up by the-locking dog 2,6. andthe work, spindle i5 is therefore held against rotation. For. thispurpose, the track 58; of thecam 59 maybe formed with a dwell portion inwhich the. roller 55- travels during formation-of a tooth surface OfythGgear. Periodically, however... the, cam 5E1 operates, to swingthe yokemember 5.] about itspivot 52 to shift the shaft: 41 forwardly to bring.thev rotating cam; 36 into operative engagement with the nose 4050f thelock, lever 25., and to bring the pin 35 simultaneously into operativerelation with the Geneva wheel ll. As the cam 36 rotates in operative,position, arise in the cam track causes'the locklever 25, to be swungabout its pivotpin. 21 todisengage the locking-dog 26 from the index Thepin 35 is;so located on the cam 36.- that, at the moment. ofdisengagement of the locking-dog from the index plate,. the pin 35enters-a notch 2l of the Geneva wheel, as-shown in Figs. 1 and 10. As,thecam 36 continues to rotate, then, the pin 3,5 revolves the Genevawheel through the. angular. distance between two. successive notches oithe: Geneva wheel, thus indexing thework spindle. ing movement, the nose40 of the-lockinglever 25 rides down 'ofi of the high part of the-cam 36and, as the pin 35-moves out of engagementw-ith the Geneva wheel, thedogmoves into" a new notch-of the index plate to relock the work spin-2,188,996 dle against rotation. As soon as the indexing." has beencompleted, the cam50 operatesto move indexing cycle is thus completed.

At the end of the index- I the shaft 41 rearwardly again "to withdrawthe cam 35 and pin 35 from operative position. The

To prevent the locking dog 26 from jumping out of engagement with theindex plate until the I 5 dog is, positively disengaged therefro'rmjaspring pressed rod N9 (Figs. 1, Zanjd &1) is provided. This rod isadapted to engage behi'nd'the block 38. when the locking dog 26 is inlooking position.

The rod '58 slides in a block H which is secured t is normally pressed Iinto operative position by a coil spring'IZ that to the work support 28.

surrounds the rod and is interposed between the "head of the rod and theend wall of the bore or recess in which the rod slides. 'The rod it issecured at its rear end: to a lever 74 (Fig. 2) .The

lever M is pivoted intermediate its ends upon the n20 I posite. thatwhich. is connecteclto thelrod llilgthe support lfi by means of a pin75. At theend op,-

lever carries a. ,hardened. contact member 16., which engages with ahardened contact member;

ll that is secured in one side of the yoke member,

5!. Thus, as thev yokememberk 5!. is rocked by the cam 50 to movetheshaftl'lto andfromopenative position,v the lever '15 is rocked.toimovethe rod it from and to operative position. In Fig. 4,

the locking dog 25' is shown. out of operativeposition and the, rod illis in. the withdrawn] position.

ward by the movement of the yoke .mernber'5 la so that it engages behindthev block tdto assistc inholding, thelocking dog. 2% inlockingposition.

39. 3 When. the locking dog 25 -is.reengaged..with the indexplate it,however, the; rod Ill is.moveda-for- The indexing mechanism abovedescribed is .ior a machine where the work spindle is stationary? 1during formation of the toothspacesbf: agear.

The indexing. mechanism illustrated in; Figs. 5,to,

9 inclusive is for a machine of the genera-rising type where: the workspindle rotates. during formation oi the tooth spaces of the gear.:.,'I'halatteri-ndex mechanism will now be described.

8t denotes the work head of a gear ing machine; Thework spindleti; ofthev machine is suitably journaled. on. anti-friction bearings 8.2 f

and 83; in. this workhead. The gear whichls to be cut or ground isdenoted atG; .It isof the long '5 shanktype, being, provided. with.aninteg'ral shank or shaft denoted at 8:.3.- Thiswork piece is se-'cured by a co1let-8 l,which.maybe of standard construction, in anarborq85 that is. mounted; in the bore of the work, spindle. Thecollati's threaded to a sleeve 8?, which is .moun'tedatits rear end inthebushing 88.

The bushing 38 isin turn mountedv in a thimbletii thatisthreaded in therear'end of the work spindle.

A coiled; spring 96, that isrinterposed ashoulder formed in. the workspindle and a washer Bl, serves to urgethe sleeve 8? and col-let 84rearwardlytoclarnp the vvorkiagainst rotation The washer 9 Iv seats.against the nut 523 that is threaded-on the; sleeve relative tothe Workspindle.

This piston'is. mounted to reciprocate in acylinder 99 that is formedintegral withthework I head 85. The piston Q8 is-adapted to beactuatedby fluid pressure.

the, lever ismoved clockwiseabout its pivot 56 When it is movedrearwar'd'ly,

30 dex plate I00.

a roller II6, by means of the pin H1. The lockto force the sleeve 81forwardly against the resistance of the spring 90 to release the collet84 and dechuckathe work. v

The indexing mechanism of the embodiment illustrated includes a notchedindex plate I00 and a Geneva wheel IOI. The indexplate I00 is formedwith as many notches I02 as there are tooth spaces in the gear G whichis to be cut or ground. The Geneva wheel IOI also has asmany notches I03as there are tooth spaces in the gear threaded on the spindle.

The generating roll is imparted to the work spindle through a bevel gearsegment I05. This segment, as usual, is driven in time with the motionof the cradle of the machine. The segment I05 is secured in any suitablemanner to the head I06 of a sleeve member I01 that is journaledonanti-friction bearings I08 and I09 in the work head. There is a pin I I0secured in any suitable mannerinthe head I06 of the sleeve member 26I01. An index lock lever II2 is'pivotally mounted on this pin IIO bymeans of suitable'anti-friction bearings I I3. and I I4.

Thelock lever -I I2 carries alocking dog I I5 that is adapted to engagein the notches I02 of the in- The locking lever I I2 also carries ingdog is constantly urged into engagement with the index plate I00 by aspring pressed plunger II8 that is housed in a boss II9 which is formedintegralwith the head I06 of the sleeve member I01. The plunger I I8 isactuated by acoil spring I20. fThe plunger engages with the tail of :thelock lever II2. P

.The roller II6'is adapted to be engaged with lfltheperiphery ofacam-member I25. This cammember is mounted to slide upon a stud I26 thatis secured in the head I06 of the sleeve member I01., The cam-member isintegral with a pinion I28; This pinion meshes with a long-faced gear41.5. I29 that is mounted on a stud I3I which is also secured in thehead I06. The gear'l29 meshes with an internal gear segment I30. Thesegment i is mounted coaxially of the work spindle and may be formedintegral with the work head 80. It is 50,-; stationary relative to thehead I06 and bevel gear segment I05. Hence, as the segment I05 rocksin'one direction or the other, the gear I29 rolls in one direction orthe other on the segment I30 and'imparts corresponding rotation to thepinion 55.128 and the cam I25. I

@The cam I25-carries a'pin I 32, that is adapted to be'brought intooperative relation with a notch I03 of the Geneva wheel IOI when the camitself Nisbrodght into operative engagement with the 60 rollerI I6 ofthe lock lever H2. 1 i g The movement of the cam I25 into and out ofoperative position .is effected by reciprocation of the sleeve I34 withwhich both the cam I25 and pinion I28 are formed integral. Thisreciproca- 65 ;,tory movement is effected by the relative-rotarymovement between the head I06 of the sleeve. member I01 and the workhead 80. There is a lever" I35 secured to one end of a pin I36 that isrotatable .in the work head 80. -'A guide member- 7o,-';I31 is formedintegral with one side of this lever I35; {This guide member I31 (Fig.9) has a guide-way I38 at one side thereof that terminates ina slabbedoff portion I39. At its opposite side,

the guide member ;I 31-is formed with guide-ways 75: .;I 40 and -I 41which are inclined at an obtuse angle to one another; ,,,The guide-wayI40 makes a sharp acute angle with the guide-way I38 and theguideway I39makes an acute angle with the guide-way I4I. t I

Secured to the pivot pin I36 is an arm I43. A spring-pressedplunger'I-44 engages this arm to constantly urgethe lever I35 inaclockwise direction about its pivot I 36; to hold: the slabbed offportion I39 01 the guide member I31 against one side face of the segmentI30, as shown in Fig. "I. The plunger E44 is housed in a boss I45 thatis secured to the work head 80 and the plunger is held in engagementwith the arm I43 by the coil spring Pivotally mounted upon the head I06of the sleeve member I01 is a lever I50. There is a roller I5I carriedin one arm of this lever. This roller is adapted to ride on the waysI38, I39, I4 I, and M0 ofthe guide'member I31, as the head I06.oscillates back and forth in the generating roll of. the machine. 5There is a pin I53 mounted in another arm of this lever. This pincarries a shoe I54 (Figs. 5 and 6) which engages in a peripheral grooveor recess I55 that is formedin the sleeve I34.

The lever I50 is normally urged in a clockwise direction, about itspivot I51 by a spring-pressed plunger I which engages with the lug I6Ithat is formed integral with the lever and that projects from one sideof the same.- The plunger I60 is housed in a boss I62that is formedintegral with the, head I06 of sleeve member I01. The plunger isconstantly held in engagement withthe lug I6I by action of the coilspring I63. I

The operation of the index mechanism of Figs. 5 to 9 inclusive will beobvious from the preceding description but may now be briefly summed.up. During formation of the tooth surfaces of the work piece G, theindex mechanism is locked up, that is, the index lock dog H5 is inengagement withone of the notches I02 61. the index plate I00 so thatthe work spindle 8| will be rotated by the bevel gear segment I05 toproduce the generating roll oi the work. During this time the parts willbe in positions shownin Figs. 5 and 8. The head I06 of the sleeve memberI05 will, at this time, be rotating in a clockwise direction asviewed-in Fig. 5 and the roller I5I of the lever I50 will be riding onthe portion I38 of the relatively fixed guide member-I31 as shown inFig. 8. The cam I25 andpin I32 will at this time be held outofoperativeposition by operation of the spring-pressed plunger I60 whichis free, at this time, to rock the lever in a clockwise direction aboutits pivot I51. During the rotation of the head I06, the gear I29 willroll on the segment I30 as already described and impart rotation to thepinion I28, causing the cam I25 to rotate on its axis, but duringtheclockwise'rotation of the head I06, the rotary movement of the cam I25will be an idle movement because thecam will then be out of engagementwith the roller I I6 and the pin I32 carried by the cam will be out ofregistry with the Geneva wheel IOI.

'Duringthe continued clockwise movement of the head I06, the roller I5Iwill move over the guide surfaces I38 and I39 of lever I35. At the endof this movement the roller I 5| will ride clear of the guide'surfaceI39. As soon as this happens, the plunger IMl will operate to swing thelever I35 and. the guide member. I31 from the position showninFig. 8 tothat shown in Fig. '1 where the slabbed off portion I39 of theguide-member seats against one side surface 'of the segment I30. Theparts will so be arranged that this will happen gagement with the rollerH6 and bring the pin I32 into operative relation with the Geneva wheelIIlI. In the further return roll of the head I06, then, the rotating camI25 will cause the lock lever IIZ to be swung about its pivot III] todisengage the locking dog H5 from theindex plate Hit).- The pin- I32 isso located on the cam'I25 that'itenters a slot Hi3 of the Geneva wheelIoI as the locking dog H5 moves out of engagement with the index plateI09. Thus, as the Y index plate is being unlocked, the pine I32 movesinto position to drive the Geneva wheel IIBI to rotate the work spindle8i relative to the bevel gear segment I flfi and head I85, to effectindexing ofthe workspindle.

At the end of the indexing movement, the roller I I6 rides down oii' ofthe high part of the cam I25 and; the lock-'dog moves into a new notchof the index'plate' Hit-to relock the work-spindle again to the headii'ifi and segment I05 sot-that the work spindle again rotatestherewith. As the lock-dog thus moves into engaging position, the pin I32 begins to move out offengagement with the Geneva wheel IBI so that,when the wheel'is.

lockedup again, the'pin no longer drives.

Fig. 7 shows the positionsof the parts near the end of the return rollwhen the rollerIEI is stillriding on the portion I lll'of guide I31 andthe cam I25 and pin I32 are still in operative positions.

' Afte'r theroller has ridden clear of the lower end of the guidesurface Mil of guide member I31, the spring-pressed plunger I60 operatesto swing the lever I58 about its pivot I57 again to dis engage the camI25 from'the roller H6 and withdraw pin I32 from operative position. Theindexingcycle'isthus completed. The work spindle isagain locked up. Thedirection of roll is again reversed and the generating roll begins anewwith theroller It l travelling onthe portion I38 of the 1 trackmember'iiil as shown in Fig. 8.

It will be noted that duringthe indexing opera-' tion. itself with thesecond described embodiment of the invention, the lock-lever I I2 ismoving in a counterclockwise direction with the headIGG' while theGeneva wheel I9I and index plate I08 are moving in a clockwise directionunder actuation of, the gearing I3IiI29-I28 and pin I32.

Hence that notch I92 of the index plate, which is next to be'engaged bythe lock-dog H5, and the 1o=ck-dog I IE- will be moved toward oneanother andtheactual indexing operation itself is effectedin amuchshorter time than with the mechanismof the first described embodiment ofmy inven-' tion where the lock-dog remains relatively sta- 'tionaryduring indexing and the index plate itself must be moved through thewhole angle between two successive notches of the plate before index*ing is completed.

With either embodiment of the invention; the indexing is positivelycontrolledat all times. This is. clearly illustrated in Fig. 10. Thenotches N in the index-plate I are made of preferably truncated wedgeshape and the locking dog D i'salso made of preferably truncatedwedgeshape. Thus 75; gas soon as.therlocking' dog begins to move out o'fengagement with a notch or the index plate, its sides begin to clear thesides of the notch as clearly illustrated by the successive dotted lineposincnsyot the dog in Fig. 10, which ind cat suc c'essive positions ofthe dogasitifioves out or operative position. I Y j Now, the notches Sof the Geneva wheel W are radial of the axis of the work spindle just asare I the notches of the index plate; The pin P can movesconsiderabledistance into a notch S of the Geneva wheel, then,- beforemuch movement is imparted to' the wheeh This is shown clearlydn Fig. 10where successive positions of the pin, asjit moves into a notch of thewheel are indicated in dotted lines and the path of movement of the 15pin in'the indexing operation is indicated 'g'enerally at X. a I

The'co'n'stru'ction of thegindex mechanisrii'is sueh,-then, that'the pinP can enter a notch SI Qf' the Geneva wheel before the dog Dis fullydis'eri-. gaged' from a notch N of the index plate; Thus the p'inwill bein position to control the move?" ment of indexing before the lockingdog has fully I released itscontrol of the position of the indexplate'an'd work spindle.

. With the index-mechanism of this invention, fullcontrol is maintainedat the end of the in dex-ing operation, also." The locking" dog D canmove into a notch N of the index platein' the re verse of the movementillustrated in Fig. 10 be fore thepin P has completely moved out of'n vgage'm'ent with a notch S of the Geneva wheel. This is truebecausethesides of the locking dogD clearthesides'ofa notch N until.thelocking'dog is fully seated and because the pin P at the end of itsindexing movement'will again be moving approximately radially andimparting little or no movementto the Geneva wheel. Thus the locking dogD may be nioved into position *to control the position of the workspindle before the pin P releases control'of the'Geri'eva wheel." Theindexing mechanism of the present inven; tion, therefore, is positive inits action andfposi tive in its control. It constitutes 'a'ma rkedprov'einent, then, over notched plate index mean anism's hereoforeused.In prior-type notched plate index mechanisms, the locking dog' has"ordinarily had to be disengaged'before the mat: ing mechanism could beengaged and in 'pri'o type notched plate index mechalnisms, the loo ingdog has been allowed to drop back onto the} periphery of theindex platebe'fore theindex'ing' operation is completed so that the dog enterthenext notch" of the index 'plateflund'e'r the dog; Qne objection top'ricrtypes ofnotched plate index mechanisms'is theirequency of fail ure'ofthe mechanism to index properly when" I operated at high" spee'ds'i' Thelocking do'g wnr ratchet over the notch of the index plate and riotenter" it. This is impossible with'the indexing mechanismof thepresentinvention since thein-g dexing is positively contr'o'lled'ati alltimes and the locking'dogis moved into a notch ofthe index platebefore=the pin is fully out of engagement withthe Geneva wheel.- v pWhile the invention has'been described'in con- I nection'with twodifferent embodiments thereof, it will be understood that it is capableof sti further modification. This application is in tended to cover anyvariations, uses; oradaptations' of" the invention following, ingeneral; the f principles of the invention and including: suchdepartures from the present disclosure as com within: knownoroustomarypractice in mean to respectively, so that when the cam is inoperative v which the invention pertainsand as may .be applied to theessential features hereinbefore set forth and as fall within the scopeof the invention Geneva wheel to rotate said wheel, and meansfor'rotating the cam.

12. In an indexing mechanism, a notched plate, a locking dog adapted toengage the plate to hold the plate against rotation, a Geneva wheeloperatiiiflly, connectedto the plate, a' rotatable cam, apinjo'pe'ratively' connected to the cam to rotate therewith and adaptedto. engage the Geneva wheel to rotate said wheel, means for rotating thecam, and means for periodically moving the cam to cause it to engage thelocking dog and to move the pin simultaneously into operative relationwith the Geneva wheel whereby, on continued rotation of the cam, thelocking dog'is disa pin secured to one face of the cam, means forrotating the cam, and means for periodically shifting the cam axiallytobring the, cam into operative engagement with the locking dogand thepin into operative relation with the Geneva wheel whereby, as the camrotates, the locking dog is disengaged and the pin engages a notch ofthe Geneva wheel to rotate the wheel to effect the indexing movement,said last named means being operative to retract the cam axially whenthe indexing operation is completed.

4. In a machine for producing gears, the combination with a rotatablework spindle and a sup port in which the work spindle is journaled, ofan indexing mechanism comprising an index plate operative relation'withthe Geneva wheel where-' by, on continued rotation of the cam, thelocking dog is unlocked and the pin rotates the Geneva wheel to effectindexing of the work spindle, said last named means being operative alsoto retract the cam axially when the indexing operation i completed. 5.In a'machine for producing gears, the combination with a rotatable workspindle and a support in which the work spindle is journaled, of anindexing mechanism comprising an index plate and a Geneva wheel, each ofwhich is secured to the spindle, a locking dog adapted to engage a notchof the index plate to hold the plate against I rotation, a rotatablecam, a pin carried by said cam, means for rotating the cam, and meansoperable in time with the cam rotating means for reciprocating said camaxially to move the cam and pin alternately into and outof operativerelation with the locking dog and Geneva wheel,

position, the locking dogwill be disengagedby the cam in itsrotationandthe Geneva wheel will. i

be rotated by the pin to index the work spindle.

6. In a machine for producing gears, the combination with a rotatablework spindle, anarm oscillatably mounted thereon,and means for 0sci1-'lating said arm, of an indexing mechanism com-' prising an index plateand a Geneva wheel, each of which is secured to the work spindle, alocking dog mounted on said arm and adapted to engage a'notch or theindex plate, a cam rotatably' and reciprocably mounted on said arm andadapted to be moved into engagement with the locking '7. In a machinefor producing gears, the combination with a rotatable Work spindle, anarm oscillatably mounted thereon, and means for oscillating said arm, ofan indexing mechanismv comprising an index plate and a Geneva wheel,

each of which is secured to the work spindle, a locking dog mountedonsaid arm and adapted to engage a notch of the index plate, acamrotatably and reciprocably mounted on said arm and adapted to bemoved into engagement with the locking dog to release the same, a pincarried by said cam adapted to be moved into operative relation with theGeneva wheel, on movement of the cam into engagement with the lockingdog, to rotate the Wheel after the dog has been disengaged, meansoperated by the movement of the arm for rotating the cam in a directionopposite to the direction of movement of the arm, and means for movingthe cam into and out of operative engagement with,

the locking dog.

8. In a machine for producing gears, the combination with a rotatablework spindle, an arm oscillatably mounted thereon, and means foroscillating said arm, of an indexing mechanism comprising an index plateand a Geneva wheel,

each of which is secured to the work spindle, a locking dog mounted onsaid arm and adapted to engage a notch of the index plate, a camrotatably and reciprocably mounted on said arm and adapted to be movedinto engagement with the locking dog to release the same, a pin carriedby said cam-"adapted to be moved into operative relation with the Genevawheel, on movement of the cam into engagement with the locking dog, to

rotate the wheel after the dog has been disen-' gaged, means operated bythe arm in its movement for rotating the cam in a direction opposite tothe direction of movement of the arm, and means operated by the movementof the arm for moving the cam into and outof operative position 9. In amachine for producing gears, the com-- I bination with a rotatable workspindle, an arm oscillatably mounted thereon, and means for oscillatingsaid arm, of an indexing mechanism comprising an index plate and aGeneva wheel,

each of which is; secured to the work spindle, a locking dog carried bysaid arm and adapted to engage a notch of the index plate, a camrotatably I and reciprocably mounted on said arm and adapted to be movedinto engagement with the locking dog to release the same, a pin carriedby said cam adapted to be moved into operative relation with and out ofoperative relation with the locking dog.

. 110;. In a machine for producing gears, the com bination with arotatable. work spindle, an arm oscillatably mounted thereon, ancl'meansfor oscillating said arm, of an indexing mechanism comprising .an indexplate and a Geneva wheel,

' each of which is secured to thework spindle, a

locking dog mounted'on said arm and adapted to engage a 'notch'of theindex plate, a cam rotatably and reciproc'ab'ly mounted on the arm andadapt: ed to be mojiye'd into'enga'gement with the locking dog torelease the same, a'pin carried by the cam andadapted'to be moyed intooperative relation withtheGeneva Wheel to rotate the wheel after thelocking dog has been released, a relatively stationary gear, a gearcarried by said arm meshing with sai'd 'stationarygear and operatively.con-' nected with the cam for rotating the 'cam on rotation of the arm,a relatively fixed cam member, and a follower carried by said arm andadapted to engage said cam member and connected to the first named camto shift the first cam into and 914? Q? erativ e agement w th. the egg nmg on oscillation of the arm in opposite directi pin so that before oneof these members is disengaged from the part with which it coo ates, theother member will have entered a no, In I of the part with which itcooperates.

12. In anindexing mechanism, a notched plate 15 av ng w r m e ru cat dfi- M Q b a.lockingdog of truncatedjV-shapejinoya' o, and fromengagement with the plate and ada when in," engagement with theplat t"plate against rotation, a Geneva 'w eel ope at connected to the plateapin adapted to, r' h Whe a lat nd means iqntr e m'oyement oi the dog andpin S'Qtha't bef orfe of th I members is ull disengaged from w h wh ch toepera ee; e'o he till have eetnedq men-Qt ihe-p rti th wh T F QQP'JefQJ LEONARD.

